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                [Usaco2007 Open]Catch That Cow 抓住那只牛                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point N (0 &lt;= N &lt;= 100,000) on a number line and the cow is at a point K (0 &lt;= K &lt;= 100,000) on the same number line. Farmer John has two modes of transportation: walking and teleporting. * Walking: FJ can move from any point X to the points X-1 or X+1 in a single minute * Teleporting: FJ can move from any point X to the point 2*X in a single minute. If the cow, unaware of its pursuit, does not move at all, how long does it take for Farmer John to retrieve it? </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;农夫约翰被通知，他的一只奶牛逃逸了！所以他决定，马上幽发，尽快把那只奶牛抓回来．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;他们都站在数轴上．约翰在N(O&le;N&le;100000)处，奶牛在K(O&le;K&le;100000)处．约翰有</span></div>
<div><span style="font-size: medium">两种办法移动，步行和瞬移：步行每秒种可以让约翰从z处走到x+l或x-l处；而瞬移则可让他在1秒内从x处消失，在2x处出现．然而那只逃逸的奶牛，悲剧地没有发现自己的处境多么糟糕，正站在那儿一动不动．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;那么，约翰需要多少时间抓住那只牛呢？</span></div></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* Line 1: Two space-separated integers: N and K </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;仅有两个整数N和K.</span></div>
<p></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* Line 1: The least amount of time, in minutes, it takes for Farmer John to catch the fugitive cow. </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;最短的时间．</span></div></p><hr/><h3>样例输入</h3><pre>5 17
Farmer John starts at point 5 and the fugitive cow is at point 17.

</pre><hr/><h3>样例输出</h3><pre>4

OUTPUT DETAILS:

The fastest way for Farmer John to reach the fugitive cow is to
move along the following path: 5-10-9-18-17, which takes 4 minutes.</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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